B．Humans have the tendency to fight.

　　C．Humans may find new sources of food.

　　D．Humans don't like to stay in the same place.

　　答案　A　[细节理解题。由第二段第一句话Perhaps the best answer lies in our genetic makeup(基因构成)as human beings.和此段最后一句Perhaps the best reason for exploring space is this genetic tendency to expand wherever possible.可知A项正确。 ]

　　42.The underlined word “spin­offs” in Paragraph 4 probably refers to________.

　　A．survival chances B．potential resources

　　C．unexpected benefitsD．physical possessions

　　答案　C　[词义猜测题。由第四段中的We have already benefited from other spin­offs including improvements in earthquake prediction，in satellites for weather forecasting and in communications systems. 可推出，此处spin­offs意为“意想不到的好处”。survival chances 生存机会；potential resources潜在的资源；unexpected benefits意想不到的好处；physical possessions物质财产。故选C。]

　　43.What makes it possible for humans to live on other planets?

　　A．Our genetic makeup.

　　B．Resources on the earth.

　　C．The adaptive ability of humans.

　　D．By­products in space exploration.

　　答案　C　[细节理解题。由倒数第二段最后一句Without the ability to reach out across space, the chance to save ourselves might not exist.和最后一段中的It is true that the lifestyle would be different, but human life and cultures have adapted in the past and surely could in the future.可以得出人类的适应能力使得人类居住在其他星球成为可能。 ]

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